Oil Pressing
CCP-2: Temperature Control & Solvent Recovery
Process Objective
Extract flaxseed oil from kernel while preserving native fatty acid profile and minimising oxidative degradation. Two routes: cold pressing and solvent extraction.
Equipment Configuration
Cold Pressing Route
Kernel → Screw Press (T < 40°C) → Crude Oil → Plate Filter → Polish Filter → N₂ Flush → Packaging
Cold-Pressed Cake → Flaker → Hexane Extractor → Miscella → Evaporator → Crude Oil
→ Defatted Meal → Desolventiser → Meal
Cold Press Specifications
| Unit |
Type |
Model |
Capacity |
Power |
| Screw press |
Single-screw |
SP-300 |
500 kg/hr |
15 kW |
| Plate filter |
40 plates |
PF-200 |
500 L/hr |
2.2 kW |
| Polish filter |
Candle type |
CF-100 |
500 L/hr |
1.5 kW |
| N₂ generator |
PSA |
NG-50 |
50 Nm³/hr |
7.5 kW |
Process Parameters (Cold Press)
| Parameter |
Set Point |
Tolerance |
| Kernel temperature at feed |
30°C |
± 2°C |
| Barrel temperature (max) |
40°C |
absolute |
| Screw speed |
15 RPM |
± 2 RPM |
| Nozzle diameter |
8 mm |
± 0.5 mm |
| Oil yield (pressing) |
32–38% |
— |
| Residual oil in cake |
8–12% |
— |
| Parameter |
Value |
Unit |
| Hexane temperature |
55–60 |
°C |
| Extraction time |
45–60 |
min |
| Miscella concentration |
20–25 |
% oil |
| Residual oil (defatted meal) |
< 1.5 |
% |
| Hexane loss |
< 0.5 |
L/MT meal |
Quality Monitoring (CCP-2)
| Check |
Frequency |
Critical Limit |
Action |
| Press temperature |
Continuous |
< 40°C |
Reduce feed rate or stop |
| Peroxide value |
Every batch |
≤ 2.0 meq/kg |
Hold for review |
| Residual hexane (meal) |
Every batch |
< 50 ppm |
Rerun desolventisation |
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